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prio_validator.rb
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Thu, Apr 24, 3:31 PM

prio_validator.rb
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# Validates DNS priorities [0, 65535]
class PrioValidator < ActiveModel::EachValidator
# Adds an attribute error if value is not a valid DNS priority.
def validate_each(record, attribute, value)
# Rails autocasts integer fields to 0 if a non-numerical value is passed
# we override that by using th *_before_type_cast helper method
before_cast = :"#{attribute}_before_type_cast"
raw_value = record.send(before_cast) if record.respond_to?(before_cast)
raw_value ||= value
val = Integer(raw_value)
if val < 0 || val > 65_535
record.errors[attribute] << 'is not a valid DNS priority [0, 65535]'
end
rescue ArgumentError, TypeError
record.errors[attribute] << 'is not a valid DNS priority [0, 65535]'
end
end

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